Small-q phonon-mediated unconventional superconductivity in the iron pnictides

被引：23

作者：

Aperis, A. ^{[1
]}

Kotetes, P. ^{[1
,2
]}

Varelogiannis, G. ^{[1
]}

Oppeneer, P. M. ^{[3
]}

机构：

[1] Natl Tech Univ Athens, Dept Phys, GR-15780 Athens, Greece

[2] Karlsruhe Inst Technol, Inst Theoret Festkorperphys, D-76128 Karlsruhe, Germany

[3] Uppsala Univ, Dept Phys & Mat Sci, S-75121 Uppsala, Sweden

来源：

PHYSICAL REVIEW B | 2011年 / 83卷 / 09期

基金：

瑞典研究理事会;

关键词：

TEMPERATURE; DEPENDENCE; YBA2CU3O7; GAP;

D O I：

10.1103/PhysRevB.83.092505

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report self-consistent calculations of the gap symmetry for iron-based high-temperature superconductors using realistic small-q phonon-mediated pairing potentials and four-band energy dispersions. When both electron and hole Fermi surface pockets are present, we obtain the nodeless s(+/-) state that was first encountered in a spin-fluctuation mechanism picture. Nodal s(+/-) as well as other gap structures such as d(x2-y2), s(+/-) + d(x2-y2), and even a p-wave triplet state, are accessible upon doping within our phononic mechanism. Our results resolve the conflict between phase-sensitive experiments reporting a gap changing sign, attributed previously only to a nonphononic mechanism, and isotope effect measurements proving the involvement of phonons in the pairing.

引用

页数：4

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